F. Mirjalili - Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
S. Moradian - Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
F. Ameri - Department of Color Physics, Institute for Color Science and Technology, P.O. Box 16765-654, Tehran, Iran

In the present study, attempts were made to find the correlation between visually perceived and instrumentally measured specular gloss of a series of black samples. To this end, a black physical scale of specular gloss was prepared using a lithographically printed black paper. The samples were visually evaluated by a panel of 14 observers, by utilizing an also prepared color constant lightness scale, in an especially designed unidirectional illumination cabinet at the 20˚, the 60˚ and the 85˚ illumination/observation geometries. Analyzing the correlation between visually percepted and instrumentally measured specular gloss showed that the 60˚ geometry is efficiently capable of quantifying specular gloss in a manner that human observer perceives.

Specular gloss – Glossmeter - Visual perception - Unidirectional illumination